Heney mathey



(No Model.)

' H. MATHEY.

MANUFACTURE 0]? LIME 0R GEMENT. No. 369,353. Patented Sept. 6, 1887.

N. PETERS, Fhmvwhugnphur, Washmglun uc.

UNITED STATES HENRY MATHEY, OF RONDOUT, NEW YORK.

MANUFACTURE CF LIME. OR CEMENT.

SPECIFICATION forming part of Letters Patent No. 369,353, dated September 6, 1887.

Serial No. 223,364. (No model.)

T 0 all whom it may concern:

ie it known that I, HENRY llIATHEY, a citizen of the United States, residing at Rondout, in the county of Ulster and State of New York, have invented certain new and useful Improvements in Kilns for the Manufacture of Lime or Cement; and I do hereby declare the ibllowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to kilns for the manufacture of lime or cement; and it consists in a receiving-chamber provided with air-inlets and openings for vapor-burners, a drawingchamber provided with air-ductsleading therefrom to the top of the kiln, an automatic feed for feeding the material from the receiving to the drawing chamber, conveyers for automatically discharging the material from the drawing-chan1her,an d other details of construction, which will be hereinafter described, and pointed out in the claims. a

The accompanying drawing illustrates my invention, and the several parts of the device are indicated by letters of reference marked thereon.

Referring more particularly to the drawing, the kiln proper consists of a shell or wall, A, of suitable dimensions. The interior is a receiving-chamber, A, tapering or diminishing at A, so that the crushed and burned material falling from the cylinder H will concentrate at the bot-tom of the chamber. This chamber is closed at the bottom by a reciprocating slide, 0, actuated by a suitable crank arm or lever, (Z. This permits the material to fall at intervals into the drawing-chamber B, (which is preferably arched,) where it comes into contact with the cold air, and from whence it is automatically conveyed by the screw-conveyers E to the floor of the pulverizers or to the pulverizers direct.

It has been found by research and experiment that the hot cement suddenly coming into contact with cold atmospheric air undergoes certain chemical reactions which give to it increased hydraulicity, as well as a desired shade of color. These reactions take place in the chamber 13. It is essential that the air be admitted while the cement is in its highest state of heat, as the stone is then porous and better adapted to absorb the oxygen. It is also essential that the air be excluded from the chamber A, (except that admitted at the top through the openings 0 for support of combustion,) as the admission of such air into the mass of the cement would reduce the temperature requisite in said chamber. To accomplish these results I have provided air-channels a, leading from chamber B, around chamber A and thence through dustchambersf to stack K.

It is understood that the cement-rock (or limestone) is first crushed and calcined under agitation, as described in my patents Nos. 330,603 and 339,309.

The operation is as follows: The crushed material from the revolving cylinder H is fed into chamber A where it is met by the heat generated by means of the vapor-burners inserted in openings 1). As the material gradually descends to the bottom of this chamber it passes through the last of the various changes and reactions relative to the expelling of the carbonic acid and water of crystalization. As it reaches the bottom the reciprocating slide 0, actuated by the rod (1 through the intervention of a cam, cl, on shaft d permits a certain portion at given intervals to pass into the chamber B. This chamber is open to the air, and here the heated material comes into contact with the oxygen of the air, and as it falls toward the conveyors E there is an opportunity for the oxygen to reach all the particles. The ducts acreate a strong draft,which carries upward the hot air and deposits any fine material in the dust-chambers f. The material in chamber Bis thus quickly reacted upon and cooled. It is obvious that the airducts a may be onthe outside of the kiln instead of inside, as shown, without departing from the spirit of my invention.

Having thus described my inventiomwhat I claim as new, and desire to secure by Letters Patent, is-

l. A kiln provided with a material-receiving chamber, means for alternately and automatically opening and closing the same at or near the bottom, a drawing-chamber provided with means for withdrawing the material therefrom, and air ducts leading therefrom, whereby a current of cold air is maintainedin ICO said chamber and the material oxidized and the top of the kiln, as and for the purposeset cooled, as set forth. forth.

2. In a kiln, the combination, with mean In testimony whereof I affix my signature in for heating the material, of a receiving-champresence of two Witnesses.

5 her, means for automatically opening and clos- HENRY MATHEY.

ing its lower end, a drawing chamber, and Witnesses:

means for Withdrawing the calcined material, G. WEBSTER,

and air-ducts leading from said chamber to CHAS. REYNOLDS. 

